Q3/ In a cement store there are (750) bags, (400) of which are salt- resistant, (200) of them are unusable, and half of the unusable is of the salt- resistant type, when one bag is randomly with drawn from the store found : 1- Prob that it may be salt- resistant and unusable ? 2- Prob that it may be usable if it is salt- resistant ? 3- Prob that it may be resistant to salt if it is not usable ?

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Q: then E(y) and V(y) are

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